1, leakage protector technical conditions should be in line with the relevant provisions of GB6829, and has a national certification mark,
The technical rating of the line or equipment being protected to match the technical parameters.
2, according to the power supply mode of electrical equipment leakage protector:
① single-phase 220V power supply of electrical equipment should be selected two-pole two-wire or single-pole two-wire leakage
protector.
② three-phase three-wire 380V power supply of electrical equipment, should be used three-pole leakage protector.
③ three-phase four-wire 380V power supply electrical equipment, or single-phase equipment and three-phase equipment **** with the circuit, should be used three-pole four-wire, four-pole four-wire leakage protector.
3, according to the normal leakage current of the electrical line, select the leakage protector rated leakage action current.
① Select leakage protector rated leakage action current value, should take into full account the normal leakage current value of the protected line
and equipment may occur, if necessary, through the actual measurement of the protected line and the equipment can be obtained by the normal current value.
② selected leakage protector rated leakage current, should not be less than the maximum value of electrical lines and equipment
normal leakage current 2 times.
4, according to the environmental requirements of electrical equipment leakage protector:
① leakage protector protection level of English environmental conditions.
② the power supply voltage deviation of electrical equipment should be prioritized electromagnetic leakage protector.
③ In the high temperature or special low temperature environment of the electrical equipment should be prioritized to use electromagnetic leakage protector.
④ frequent lightning activity in the area of electrical equipment should be prioritized to use the shock voltage non-action type leakage protector.
5 installed in flammable, explosive, humid or corrosive gases and other harsh environments leakage protector, should be selected according to the relevant standards of special protective conditions of the leakage protector, or should take appropriate protective measures.
5, the leakage protector action parameters:
① hand-held power tools, mobile appliances, household appliances socket circuit equipment should be prioritized to use the rated leakage action current is not greater than 30mA fast-acting leakage protector.
② Single motor equipment can be selected for the rated leakage action current of 30mA and above, 100mA or less fast-acting leakage protector.
③ more than one piece of equipment should be selected for the total protection of the rated leakage action current of 100mA and above the rapid action of the leakage protector.
6, for special loads and places should be selected according to its characteristics leakage protector:
① hospitals in the installation of medical electrical equipment leakage protector, should be used for rated leakage current of 10mA, fast-acting leakage protector.
② Electrical equipment installed in wet places should be rated leakage current of 15-30mA, fast-acting leakage protector.
③ Installed in swimming pools, fountains, water playgrounds, bathrooms, lighting lines, should be rated leakage action current of 10mA, fast-acting leakage protector.
④ Working on metal objects, operation of hand-held power tools or traveling lights, should be rated leakage action current of 10mA, fast-acting leakage protector.
⑤ Connecting outdoor overhead lines of electrical equipment should be used shock voltage non-action type leakage protector.
⑥ with the total protection of the overhead line should be selected in the low sensitivity and delayed action leakage protector.